Repurposing screen identifies mebendazole as a clinical candidate to synergise with docetaxel for prostate cancer treatment.

Abstract

BACKGROUND:

Docetaxel chemotherapy in prostate cancer has a modest impact on survival. To date, efforts to develop combination therapies have not translated into new treatments. We sought to develop a novel therapeutic strategy to tackle chemoresistant prostate cancer by enhancing the efficacy of docetaxel.

METHODS:

We performed a drug-repurposing screen by using murine-derived prostate cancer cell lines driven by clinically relevant genotypes. Cells were treated with docetaxel alone, or in combination with drugs (n = 857) from repurposing libraries, with cytotoxicity quantified using High Content Imaging Analysis.

RESULTS:

Mebendazole (an anthelmintic drug that inhibits microtubule assembly) was selected as the lead drug and shown to potently synergise docetaxel-mediated cell killing in vitro and in vivo. Dual targeting of the microtubule structure was associated with increased G2/M mitotic block and enhanced cell death. Strikingly, following combined docetaxel and mebendazole treatment, no cells divided correctly, forming multipolar spindles that resulted in aneuploid daughter cells. Liposomes entrapping docetaxel and mebendazole suppressed in vivo prostate tumour growth and extended progression-free survival.

CONCLUSIONS:

Docetaxel and mebendazole target distinct aspects of the microtubule dynamics, leading to increased apoptosis and reduced tumour growth. Our data support a new concept of combined mebendazole/docetaxel treatment that warrants further clinical evaluation.

• Authors: Linda K Rushworth, Kay Hewit, Sophie Munnings-Tomes, Sukrut Somani, Daniel James, Emma Shanks, Christine Dufès, Anne Straube, Rachana Patel, Hing Y Leung
• Journal: British journal of cancer (Br J Cancer) Vol. 122 Issue 4 Pg. 517-527 (02 2020) ISSN: 1532-1827 [Electronic] England
• PMID: 31844184 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Docetaxel
• Mebendazole

Topics

• Animals
• Antineoplastic Combined Chemotherapy Protocols (pharmacology)
• Apoptosis (drug effects)
• Cell Line, Tumor
• Cell Proliferation (drug effects)
• Docetaxel (pharmacology)
• Drug Repositioning (methods)
• Drug Screening Assays, Antitumor (methods)
• Drug Synergism
• Humans
• Male
• Mebendazole (pharmacology)
• Mice
• PC-3 Cells
• Prostatic Neoplasms
• Xenograft Model Antitumor Assays